Recent Results on Proton Charge Radius and Polarizabilities

IF 1.7 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Few-Body Systems Pub Date : 2024-02-02 DOI:10.1007/s00601-024-01878-5

Haiyan Gao, Jingyi Zhou

引用次数: 0

Abstract

The proton charge radius and nucleon electromagnetic polarizabilities are fundamental properties probing the electromagnetic structure of the nucleons. Proton charge radius is directly related to the proton charge distribution and the nucleon electromagnetic polarizabilities characterize the response of the charge/magnetic constituents inside the nucleon to external electromagnetic fields. A precise understanding of these quantities is crucial not only for understanding how quantum chromodynamics (QCD) works in the non-perturbative QCD region but also for bound state quantum electrodynamics (QED) calculations of atomic energy levels. We discuss the experimental approaches employed in the recent decades to determine the proton charge radius and nucleon electromagnetic polarizabilities. We summarize the present status of the proton charge radius puzzle and polarizabilities measurements. Additionally, we provide prospects for various upcoming experiments.

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质子电荷半径和极化能力的最新研究成果

质子电荷半径和核子电磁极化性是探测核子电磁结构的基本特性。质子电荷半径与质子电荷分布直接相关，而核子电磁极化率则表征了核子内部的电荷/磁性成分对外部电磁场的响应。准确理解这些量不仅对理解量子色动力学（QCD）如何在非微扰 QCD 区域工作至关重要，而且对原子能级的束缚态量子电动力学（QED）计算也至关重要。我们讨论了近几十年来用于确定质子电荷半径和核子电磁极化能力的实验方法。我们总结了质子电荷半径之谜和极化率测量的现状。此外，我们还对即将进行的各种实验进行了展望。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Few-Body Systems 物理-物理：综合

CiteScore

2.90

自引率

18.80%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal Few-Body Systems presents original research work – experimental, theoretical and computational – investigating the behavior of any classical or quantum system consisting of a small number of well-defined constituent structures. The focus is on the research methods, properties, and results characteristic of few-body systems. Examples of few-body systems range from few-quark states, light nuclear and hadronic systems; few-electron atomic systems and small molecules; and specific systems in condensed matter and surface physics (such as quantum dots and highly correlated trapped systems), up to and including large-scale celestial structures. Systems for which an equivalent one-body description is available or can be designed, and large systems for which specific many-body methods are needed are outside the scope of the journal. The journal is devoted to the publication of all aspects of few-body systems research and applications. While concentrating on few-body systems well-suited to rigorous solutions, the journal also encourages interdisciplinary contributions that foster common approaches and insights, introduce and benchmark the use of novel tools (e.g. machine learning) and develop relevant applications (e.g. few-body aspects in quantum technologies).